JPH03161895A - Method for transmitting/receiving optical transmission signal in fire alarm equipment - Google Patents

Abstract

PURPOSE:To expand a transmission distance and to improve the reliability of transmission by expanding a photodetecting/transmitting angle of a receiving part and providing an optical signal transmitted from a fire sensor with directivity. CONSTITUTION:The light emitting part 12a of a light transmitting/receiving part includes a projection lens 14 such as a Fresnel lens fixed on the projection window of the light emitting part 12a and a light emitting element 16 such as a light emitting diode and the element 16 is arranged oppositely to the lens 14 so that a projection angle of light goes approximately parallel beams e.g. On the other hand, a light transmitting/receiving part light receiving part 22a in a receiving part 20 includes a light receiving lens 24 such as a Fresnel lens fixed on the light receiving window of the light receiving part 22a and a light receiving element 26 for receiving a signal emitted from the element 16 of the fire sensor 10 and the element 26 is arranged on the inside of the focus of the lens 24 to expand a light receiving angle. Consequently, the transmission distance can be extended and the reliability of transmission can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION -1- [Industrial Application Field] The present invention relates to a method for transmitting and receiving optical transmission signals in fire alarm equipment.

[Background of the Invention] For example, Japanese Patent Application No. 1-163670 filed by the applicant on June 29, 1999 under the title of "Optical Wireless Fire Alarm Equipment" and July 1999. Japanese Patent Application No. 1-177098 filed on September 1, 2017, and Japanese Patent Application No. 1-177098 filed on September 12, 1999 under the title "Reception level adjustment device for space transmission signals in fire alarm equipment" -234740 and furthermore, patent application No. 1-234741.
The device is equipped with a fire detector that detects fire and a receiving section such as a controller that receives signals from the fire detector and makes various decisions, and the signal wiring from the receiving section to the fire detector is omitted. In order to do this, a system is shown in which signal transmission between the two is performed by spatial transmission of light or the like. In this case, a built-in battery is often used as the power source for the fire detector.

These patent applications also state that when installing a receiving unit such as a fire detector and controller 2 in a device that performs spatial transmission, it is necessary to ensure that signals can be sent and received between the two after installation. In order to do this, a so-called installation test is shown in which the fire detector sends an installation test signal as an optical signal to the receiving section to adjust the light reception.

[Problems to be Solved by the Invention] Although the present invention is not intended to be limited to this, it is particularly applicable to fire alarm equipment in which signal transmission is performed by optical signals, as in the above-mentioned patent application. The aim is to realize a method that can reliably transmit and receive optical transmission signals with low power consumption. A fire detector and receiver (as in the above-mentioned patent application)
In fire alarm equipment that transmits and receives data between controllers (controllers) using a spatial transmission method, such as an optical transmission method, the controller or receiver is mainly installed on a wall, so the front of the receiver should be directed toward the fire detector. There is no guarantee that it will be possible.

Additionally, fire detectors, especially when batteries or a built-in power source are used, cannot satisfy the conflicting demands of extending the life of the built-in power source and increasing transmission distance and transmission reliability. desired.

Therefore, an object of the present invention is to transmit optical signals between the optical transmitting side, that is, the fire detector and the receiving section, in a fire alarm system, such as the one in the above-mentioned patent application, which transmits signals using optical signals. The purpose of the present invention is to provide a method for optimally transmitting and receiving data.

[Means for Solving the Problem] Therefore, according to the present invention, the fire detection method converts the information regarding the fire detected by the fire phenomenon detection means into an optical signal and sends it from the first optical transceiver section (12). In a fire alarm system having a fire detection section or fire detector (10), and a receiving section (20) that receives an optical signal from the fire detection section (10) with a second optical transmitting/receiving section (22) and processes it for discrimination. , first and second lenses (14, 24) are provided on the front surfaces of the first and second optical transmitting and receiving sections, respectively, and the first optical transmitting and receiving section is configured so that the light transmitted from the first optical transmitting and receiving section is connected to the first optical transmitting and receiving section. The second optical transmitter/receiver is arranged with respect to the first lens (14) so that the radiation angle of the optical signal is narrowed, and the second optical transmitter/receiver is located inside the focal point of the second lens (24>). There is provided a method for transmitting and receiving optical transmission signals in fire alarm equipment, characterized in that the first and second optical transmitting and receiving sections transmit and receive optical signals.

[Operation] Since the receiving section is mainly installed on the wall, it is not always possible to face the front of the receiving section toward the fire detector. For this reason, it is desirable that the light receiving and transmitting angles of the receiving section be somewhat wide, and this can be achieved by arranging the second optical transmitting and receiving section inside the focal point of the second lens. There is.

Furthermore, in fire detectors, it is necessary not only to ensure that the optical transmission signal from the fire detector can reach the receiving part, but also to reduce the power consumption, for example, especially when a battery or a built-in power supply is used as the power source. At the same time, it is desired to satisfy the conflicting demands of increasing transmission distance and transmission reliability. Most fire detectors are installed on the ceiling, and it is relatively easy to direct the optical transmitter/receiver section provided on the outer periphery toward the receiver section. By arranging the first optical transceiver with respect to the first lens so that the radiation angle of the optical signal transmitted from the optical transceiver is narrow, the optical signal from the first optical transceiver has directivity. This is solved by having

[Example] Hereinafter, as an example, a case will be described in which the present invention is applied to the above-mentioned patent application, taking as an example light in the infrared region as the directional spatial propagation medium.

FIG. 1 is a diagram schematically showing the configuration of the optical wireless fire alarm equipment in the above-mentioned patent application. In the figure, a fire detector 10 includes an optical transceiver section 12 for transmitting and receiving optical signals in the infrared region; In addition, a switch SW is shown to be operated when performing an installation test. When the switch S W + is operated, an installation test signal is sent out from the light emitting section of the optical transmitting/receiving section 12 .

Further, the receiving unit 20 displays the result of discrimination processing based on the received signal from the similar optical transmitting/receiving unit 22 for transmitting and receiving with the fire detector 10 and the 6-fire detector 10. Six indicator lights L-L6 are shown provided for the purpose.

The optical signal sent from the fire detector 10 is sent, for example, when a fire detection means provided inside the fire detector 10 determines a fire based on heat, smoke, etc. A fire signal, an abnormal signal indicating an abnormality such as a sensor falling off, a voltage drop abnormal signal indicating a voltage drop abnormality, etc., a normal signal sent periodically to detect an interruption of the optical path, and a normal signal that is sent out periodically to detect a blockage of the optical path. The test result good signal is sent out when the test result is good, and the installation test signal is sent out to align the light reception during the installation test.When these signals are sent out from the fire detector 10 and received by the receiver 20, Indicator light L. of section 20. - The corresponding one of L6 is lit.

The receiving unit 20 may notify or notify the monitoring panel of the received contents and judgment results from the fire detector 10 by telephone transmission via a telephone transmission terminal and a telephone line such as an extension, as necessary. Alternatively, notification can be made by wire or wirelessly to a fire receiver, etc. at a disaster prevention center.

FIG. 2 is an enlarged cross-sectional view showing the optical transmitting/receiving sections 12 and 22 in the fire detector 10 and the receiving section 20, respectively. The optical transmitting/receiving section 12 of the fire detector 10 generally includes a light emitting section and a light receiving section for transmitting and receiving optical signals in the infrared region. It includes a light receiving part for receiving signals and a light emitting part for sending an operation test signal to the light receiving part of the fire detector 10 when performing an operation test of the fire detector 10 during periodic inspection etc. In FIG. 2, only the light emitting section 12a of the optical transmitting and receiving section 12 in the fire detector 10 and the light receiving section 22a of the optical transmitting and receiving section 22 in the receiving section 20 are shown in order to explain the transmitting and receiving method of the present invention. There is.

Light emitting unit 12a of optical transmitter/receiver 12 in fire detector 10
As shown in the figure, the light emitting element 16 includes a light emitting lens 14 such as a Fresnel lens provided in the light emitting window of the light emitting section 12a, and light emitting elements 16 and 8 such as light emitting diodes. , the projection lens 1 is set so that the projection angle is a narrow angle, for example, an angle close to a thousand-line beam.
4.

In addition, the light receiving section 22 of the optical transmitting and receiving section 22 in the receiving section 20
As shown in the figure, a light-receiving lens 24 such as a Fresnel lens provided in the light-receiving window of the light-receiving section 22a and a solar cell or the like for receiving signals from the light-emitting element 16 of the fire detector 10 are shown in FIG. A light receiving element 26 is included, and a light receiving element 2
6 is arranged inside the focal point of the light receiving lens 24 in order to widen the light receiving angle.

Since the receiving section 20 is mainly installed on a wall surface, it is not always possible to face the front of the receiving section 20 toward the fire detector 10, but by widening the light receiving angle of the light receiving element 26 in this way, it is possible to prevent fire It is possible to receive an optical signal from the sensor 10.

In addition, when the fire detector 10 is generally installed on the ceiling, the fire detector 10 is rotated from side to side during installation, and the transmitter/receiver 12 provided on the outer periphery is connected to the receiver 2 within a 360° range.
Since it is relatively easy to direct the light to 0, it is possible to transmit the optical signal to the receiver 20 with a narrow projection angle as described above.

Installation test between the fire detector 10 and the receiving part 20 in Fig. 2,
That is, when performing transmission/reception adjustment, by operating the switch SW1 of the fire detector 10, an installation test signal is sent from the light emitting part 12a, which may be a light emitting diode, of the optical transmitting/receiving part 12 of the fire detector 10, fire detector 1
The arrangement of the fire detector 10 is adjusted so that the amount of light received by the installation test signal from 0 is maximized at the receiving unit 20.

In this way, by setting the light emitting angle of the fire detector 10 to be narrow and the light receiving angle at the receiving unit 20 to be wide, the wireless detector, that is, the fire detector 10 side, narrows down the optical signal and sends it out. Signals can be sent over long distances using light energy, that is, a small amount of light emitting current. Also,
Since the receiver 20 side has a wide light receiving angle, installation conditions on a wall surface etc. are significantly relaxed.

Although the transmission of optical signal No. 101 from the receiving section 20 to the fire detector 10 was not explained, it is similar to the above explanation. All you have to do is narrow the acceptance angle.

In addition, when the fire detector 10 receives an optical signal such as a test signal from a portable command device, etc., for example during periodic inspection, a double fish point lens is provided in the light emitting/receiving part of the fire detector 10. ,
The light projection angle may be narrow, and the light receiving angle may be set to an angle at which both the receiver 20 and the command unit can receive the light.

In addition, on the receiving section 20 side, the transmitting/receiving section 22 is placed at a distance of about 30 mm to the left and right, for example, with respect to the main body or casing of the receiving section 20.
It is also possible to provide a mechanism as shown in FIG. 3 which allows adjustment by about 90 degrees. If such a mechanism is also provided in the receiving section 20, the transmission and reception between the fire detector 10 and the receiving section 20 can be adjusted even better.

In the mechanism of the receiver 20 shown in FIG. 3, the light receiver 22a of the optical transmitter/receiver 22 passes through the light receiving lens 24 formed in the main body 20a inside the main body 20a of the receiver 20. It is shown attached to a fixture 27 so as to be able to receive incident light, and one end of the fixture 27 is fixed to the main body portion 20a. A threaded opening is formed near the other end of the fixture 27, into which an adjustment screw 28 is screwed. Adjustment screw 28
One end is an L-shaped fitting 30 attached to the main body portion 20a.
The adjusting screw 28 is supported within the body so as to be rotatable about an axis. The other end, that is, the head of the adjustment screw 28 is accessible from the outside through a small hole 20b formed in the main body portion 20a, so that light can be received by rotating the adjustment screw 28 from the outside with a screwdriver or the like. It is possible to adjust the light receiving angle of the light receiving element 26 in the portion 22a.

In this case, the lens 24 is fixed to the fixture 27, and the lens 24 is
4 and the light receiving element 26 may be adjusted simultaneously.

Furthermore, by rotatably supporting the entire optical transmitting/receiving section 22 on the main body of the receiving section 20 and rotating and fixing the optical transmitting/receiving section 22, it is also possible to adjust the light receiving direction and the light transmitting direction.

[Effects of the Invention] As described above, according to the present invention, the light reception and light transmission angles of the receiving section are widened, and the optical signal transmitted from the fire detector is given directivity, so that the power consumption is reduced. This has the effect of being able to reduce transmission distance and increase transmission reliability.

[Brief explanation of the drawing]

FIG. 1 is a schematic oval diagram showing an example of fire alarm equipment to which the present invention is applicable, FIG. 2 is a partial sectional view for explaining an embodiment of the present invention, and FIG. 3 is a FIG. 3 is a cross-sectional configuration diagram showing an example of a regulator ellipse that can be installed on the receiver side. In the figure, 10 is a fire detector (fire detection part), sw is a switch, 12 is an optical transmitter/receiver part, 12a is a light emitting part, 14 is a lens for projecting light, 16 is a light emitting element, 20 is a receiving part, 22 is a light 22a is a light receiving section, 24 is a light receiving lens, and 26 is a light receiving element. 13

Claims (1)

[Scope of Claims] A fire detection section that converts information regarding a fire detected by the fire phenomenon detection means into an optical signal and sends it from a first optical transceiver section; In a fire alarm system having a receiving section that receives data and performs discrimination processing in the optical transmitting/receiving section, first and second lenses are provided in front of the first and second optical transmitting/receiving sections, respectively, and the first optical transmitting/receiving section is arranged with respect to the first lens so that the radiation angle of the optical signal transmitted from the first optical transmitter/receiver is narrow, and the second optical transmitter/receiver is arranged with respect to the second A method for transmitting and receiving optical transmission signals in fire alarm equipment, characterized in that the first and second transmitting and receiving sections are arranged inside the focal point of a lens and transmit and receive optical signals.